Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f7ec992aff2ed5…

MALICIOUS

PDF

72.4 KB Created: 2020-11-11 15:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4fff1e6f06b9e92df53ec4c997252564 SHA-1: 042d39217c6abbe88ae4a0fe7f93be5219735a56 SHA-256: f2f7ec992aff2ed5814e2c37039d5a1660f907c911b0b202ea3b3ba0e130d1ba
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead the user to phishing or malware download sites. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/aws?utm_term=harby+junior+high+website In PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/vamepebopebof.pdfIn PDF document text
    • https://nokiziwevapof.weebly.com/uploads/1/3/4/5/134507241/kivapasejap.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/5a6f19fa768b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fa6cad49ef3d.pdfIn PDF document text
    • https://vedokaxo.weebly.com/uploads/1/3/4/5/134529556/tulomapimon_ziveginusix.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/dedigeta.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/f8e39f.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/1327688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4cd2c6fb-c539-4ff0-9796-c836846619c7/free_cincinnati_bell_white_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ab850d-bb33-4497-b9f5-383b90375192/rubik_s_snake_ball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2855777b-95c6-411b-914d-b8c14b318515/96310515813.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/ge_smoke_detector_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e7cc24-edac-4b41-bf39-cc45d9aa61e5/bewepagapajuxid.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/83448435366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7867df35-101a-4511-a79c-82572e6d9f5a/cherokee_inc._is_a_merchandiser_that_provided_the_following_information_12_000.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/who_invented_the_guitar_talk_box.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 5168 bytes
SHA-256: 7cbec033335637db31652612d7604c40b82f35e4671f5790293dc03154ff674d
font_01_sfnt_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 12280 bytes
SHA-256: 316b52c9fc63c4187ae9fa1a8bf362c956ef35c345b41505270c9e38c4f3bc86
font_02_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71